May 15, 1879] 



NA TURE 



XXIU 



THE MINIATURE MICROSCOPE LAMP 



(REGISTERED) 

 PRICK i4». PORTABLE TIN CASE FOR DITTO, w. U. 



JAMES HOW & Co., 



SCIENTIFIC INSTRUMENT MAKERS, 



S, ST. BRIDE ST. (Me 2, Fester Lane), LONDON. 



EDWARD PATERSON, 



Electrical Engineer and Scientific Apparatus Manufacturer, 



3, BEDFORD COURT, COVENT GARDEN, LONDON. 



STEAM WORKS, GRAY'S INN ROAD. 



Ezperimenta in Electric Lighting carried oat 



Electrual Apparatus of all descriptions for Lecture Purptses 

 Loaned out. 



APPARATUS FOR CLASS DEMON- 

 STRATION and for SCIENCE SCHOOLS. 



ELECTRIC LIGHT APPARATUS. 

 SIEMEN'S and GRAMME'S DYNAMO 



MACHINES and LAMPS for Hire and Purchase. 



LARGE ASSORTMENT of RUHMKORFF 



COILS and VACUUM TUBES. 



PROFESSOR HUGHES' MICROPHONE. 

 ELECTRIC BELLS and INDICATORS. 

 TELEPHONES and TELEPHONE CALL 



BELLS, WIRE, &c.. for Fixing. 



PROF. S. P. THOMPSON'S LANTERN 



SLIDE GALVANOMETER, loi. 



EDISON'S ELECTRIC PEN £8 8s. 

 ELECTRIC and MAGNETIC APPA- 

 RATUS of all Descriptions. 



!^ew Illustrated Catalogue of 60 pages post free 6 stamps. 

 <')rders over ;Ca carriage paid to any part of the United Kingdom. 



C. TISLEY <& Co. 



OPTICIANS, '' 

 172, BROMPTON ROAD, S.W. 



(Close to South Kensington Mupoum). 



THE PHONEIDOSCOPE 



An Instrument for Obierving the CoIcur-Fi(^rc<! cf Litjuid Films under the 

 action of Sonorous Vibrations. 



Beinf ft visible demonstration of the Vibratory and Molecular Motion of a 

 Telephone Plate. 



The PHONEIDOSCOPE, with 3 Discs, Bottle of Solution, Descriptive 

 Pamphlet, &c., in Cardboard Box, \os. 6d. 



MANUrACTURRD AND SOLD WHOLESALE AND RETAIL BY 



S. C. TISLEY & CO., 172. BROMPTON ROAX), LONDON, S.W. 



'JKLEPHONIC ELECTRICITy. All MateriaU supplied for experi- 

 mental purposes. 



Price LUtx of EUctrical and Acoustic Apfarmtus, with Drmwinfs mnd 

 Description of the flmrmcnet^aph, Post Free, id. 



OLLOWAYS PIUS 



THIS 

 MEDICINE 



Ts a Certain Car« for all Disordtrs of the LIVES, STOHACH 

 AND BOWELS. A Great FTIBIFIEB of the BLOOD; • 

 Towerfal Invigorator of the Syatlpm, in cases of WEAKNESS 

 AND D£BILIIT, ud ia saeaMUed la Femalt Complainti. 



EAGLE INSURANCE COMPANY, 



79, PALL MALL. 

 For LiVBs only. Established 1807. 



Ket Premiums and Interest m ... .« j£396,8il 



Accumulated Funds ... .m .» ... ». .» ;£3,o83,28x 



Also a Subscribeoi Capital of more than ... .» ^1,500,000 



Reports, Prospectuses, and Forms may be had at the Office, or from any 

 o£ the Company s Agents, post free. 



GEORGE HUMPHREYS, Actuary and Secretary. 



HORNE'S POMPEIAN DECORATIONS. 

 ROBERT HORNE, 



HOUSE DECORATOR and PAPER-HANGING 



MANUFACTURER, 



41, GRACECHURCH STREET, LONDON, E.C. 



Py Spgdal Appointmmt te His Majesty th« King of Italy. 



ENGRAVINGS AND ELECTROTYPES 



FOR SALE, at prices ranging from ir. to lo^., in good condition, ready for 

 printing. Small, medium size, and large engravings, comprising a great 

 variety of subjects, suitable for PublisTiers, Advertisers, and Amateurs. 

 Specimen of any subject required sent post free on application. 



FACSIMILE OF SIGNATURE for 3*. An exact copy of any name 

 guaranteed. These signatures being engraved in bold relief, are useful for 

 Stamping Books, Circulars, and Documents, or Marking Linen, and made 

 type-high for ordinary Letterpress Printing. 



Sent post free to any address on receipt of 36 stamps. 



75, FLEET STREET, LONDON, E.G. 

 ARTISTIC— To Ladies and Gentlemen with 



some leisure time, desiring to supplement their incomes, an opportunity 

 is offered of acquiring the ART of DRAWING and ENGRAVING 

 ©n WOOD in a thoroughly satisfactory and perfect style. The terms 

 are moderate, and the hours can be made to suit the conTenience of 

 pupils. Persons residing in the country can receive full Instruction by 

 correspondence. For father particulars call or address Mr. J. Fkank- 

 LIN hJASH, Artist and Engraver, 75, Fleet Street, London, E.C. 



OLDRIDGE'S BALM OF COLUMBIA 



Prevents BaIdne^s and the Hair turning Grey, and forms the 



Basis of a Magnificent Head of Hair, Strengthens Weak Hair, 



and causes the 



WHISKERS AND MOUSTACHIOS to GROW FREELY. 



Sold everywhere, 3^. dd., 6s. 6d., and lis.. 



Wholesale and Retail. 



jj, WELLINGTON STREET, STRAND, LONDON, W.C. 

 Established Sixty Years. 



NORTH BRITISH AGRICULTURIST, 



Is the only Agricultural Journal in Scotland, and circulates extensively 

 amongst landed proprietors, factors, farmers, fann-bailiffs, and others 

 interested in the management of landed property throughout Scotland and 

 the Northern Counties of England. 



The AGRICULTURIST has also a very considerable cireulatioD on the 

 Continent of Kurope, America. Australia, and the Colonies. 



The AGRICULTURIST is published every Wednesday aftamoon in 

 time for the evening mails, and contains Reports of all the principal British 

 and Irish Markeu of the week, besides telegraphic reports of those held o* 

 the day of publication. 



The Veterinary Department ii edited by one of the leading Veterinarians 

 in the country, and is invaluable to the breeder and feeder as a guide to tha 

 rearing of animals, and their treatment when labouring under disease. 



Full Reports are given of the Meetings of the Royal Agricultural Society 

 o£ Engla:id, the Royal Agricultural Society of Ireland, the Highland and 

 Agriciiltural Society of Scotland, the Scottish Chamber of Agriculture, 

 and all the principal Agricultural Associations throughout Great Britain 

 and Ireland. 



For Advertisen addressing thenuelves to Farmers a better medium do«g 

 not exist. 



Price yi. By post, 3^. Annual Subscription, payable in advance, i4f. 



Office. — 377, High Street, Edinbureh. 



Fost4)fficfl Orders payable to Charles Anderson, Jun., Edinburgh. 

 ESTAHLISHED 1843. 



THE '^HANSA," 



Published unce 1864, in Hamburg^ is the only independent professional 

 paper in Germany, dedicated exclusively to Maritime Objects. Elssays, 

 Cntiques, Reviews, Reports, Advertisements. Strict eye kept upon the deve* 

 lopment of Maritime Affairs in every respect. Every second Sunday one 

 Number in 4tQ at least ; frequent supplements tuid drawings. Subscnptioa 

 at any time ; preceding numbers of the year furnished subsetiuently. Price 

 lu. for twelve months. Advertisements 4^. a line, widely spread by this 

 paper; considerable abatement for 3, 6, la months' in>iertion. Busine&s 

 Office: Aug. Meyer and Dieckmann. Hamburg, Atterwall, s8. Edited bj 



T. Frhbuen, M.K., Hamburg, Alexander Street, S. 



